I too have a Hybrid bike (Trek Navigator 1.0) and after doing a 28.5 mile ride last week (with ChefIsaac) I quickly realized that the bike is too heavy and lacks the proper gearing to keep up on touring rides as other riders get stronger. I am actively saving and looking at road bikes (and possibly having wheels built if needed).
On the straight flats, I get about 1/8 mile behind due to running out of gears (and not wanting to spin like crazy and burning out) and on the climbs (albeit mild compare to the guys out west), the lower gearing is OK but the bike is heavy and you can feel that the power isn't being put down as efficiently as you'd like.
Some bikes I am looking at are:
Giant Defy Series
Cannondale CAAD8 (LBS has a good sale on these right now)
Trek 1&2 series
and of course, the ebay of Craig's list bargain!